Axial flow fan blade structure and axial flow fan thereof

ABSTRACT

An axial flow fan blade structure and an axial flow fan thereof. The axial flow fan blade structure includes a fan impeller and an annular body. The fan impeller has a hub and multiple blades. Each blade has a first flow guide face and a second flow guide face opposite to the first flow guide face. The annular body is disposed on the blades. The annular body outward extends from the first and second flow guide faces and is annularly connected with the blades along the blades. The annular body not only is able to increase the strength of the blades of the axial flow fan, but also is able to reduce vibration and noise made by the axial flow fan.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to an axial flow fan blade structure and an axial flow fan thereof. The axial flow fan blade structure includes a fan impeller and an annular body. The annular body not only is able to increase the strength of the blades of the axial flow fan, but also is able to reduce vibration and noise made by the axial flow fan so as to enhance the fluid efficiency of the axial flow fan.

2. Description of the Related Art

Following the continuous advance and wide application of sciences and techniques, there is a trend to real-time mass-process data. To catch up with this trend, relevant manufacturers have developed and released various high-frequency high-speed processors. In company with the development of the processors, it has become more and more critical how to solve heat dissipation problem. In operation, a processor will generate high heat. In case the heat is not dissipated in time, the temperature of the processor will rise very quickly to deteriorate the performances of the system or even cause security problem of the system. In general, a heat dissipation device is used to dissipate the heat generated by the processor so as to ensure normal operation of the electronic components and prolong lifetime thereof.

As an example of the heat dissipation device, a conventional axial flow fan includes a hub and multiple blades. The hub is rotationally drivable by a motor to achieve the object of forced heat dissipation.

The parameters, such as angle, number, thickness and radius, of the blades of the axial flow fan will all affect the values of wind pressure, air volume, noise, etc. of the axial flow fan. The axial flow fan is mainly used to dissipate the heat generated by the CPU, power supply and the like industrial products in a computer. In order to enhance the heat dissipation effect, the blades can be strengthened by many measures one of which is to thicken the blades.

In the conventional axial flow fan, the thickness of the blades can be increased to enhance the heat dissipation effect. However, when doing this, a problem is raised. That is, after the blades are thickened, the total fluid efficiency of the axial flow fan is lowered. This will cause vibration and make more noises.

In order to eliminate the problems of vibration and noises due to the thickened blades, the thickness of the blades can be reduced. However, in this case, the rigidity of the blades will be decreased to weaken the strength of the blades. In some more serious situations, the blades may be even bent by the airflow in operation and become useless. At the present time, the above problems remain unsolved.

According to the above, the conventional axial flow fan has the following shortcomings:

1. The total fluid efficiency of the conventional axial flow fan is lowered.

2. The conventional axial flow fan is likely to vibrate and make noises.

SUMMARY OF THE INVENTION

A primary object of the present invention is to provide an axial flow fan blade structure including an annular body. The annular body not only is able to increase the strength of the blades of the axial flow fan, but also is able to enhance the fluid efficiency of the axial flow fan.

A further object of the present invention is to provide the above axial flow fan blade structure, which is able to reduce vibration and noise made by the axial flow fan.

A still further object of the present invention is to provide an axial flow fan including an annular body. The annular body not only is able to increase the strength of the blades of the axial flow fan, but also is able to enhance the fluid efficiency of the axial flow fan.

A still further object of the present invention is to provide the above axial flow fan, which is able to reduce vibration and noise made by the axial flow fan.

To achieve the above and other objects, axial flow fan blade structure of the present invention includes a fan impeller and an annular body. The fan impeller has a hub and multiple blades annularly arranged along a circumference of the hub. Each blade has a first flow guide face and a second flow guide face opposite to the first flow guide face. The annular body is disposed on the blades. The annular body outward extends from the first and second flow guide faces and being annularly connected with the blades along the blades. By means of the annular body formed on the blades of the axial flow fan, the strength of the blades is greatly increased and the fluid efficiency of the axial flow fan is enhanced. Also, the vibration and noise made by the blades can be reduced.

The axial flow fan of the present invention includes a frame body, a fan impeller and an annular body. The frame body has a receiving space and a shaft seat disposed at a center of the receiving space. The fan impeller is rotatably assembled with the shaft seat. The fan impeller has a hub and multiple blades annularly arranged along a circumference of the hub. Each blade has a first flow guide face and a second flow guide face opposite to the first flow guide face. The annular body is disposed on the blades. The annular body outward extends from the first and second flow guide faces and is annularly connected with the blades along the blades. In operation of the axial flow fan, the annular body not only is able to increase the strength of the blades, but also is able to reduce vibration and noise made by the axial flow fan to more effectively enhance the total air volume.

BRIEF DESCRIPTION OF THE DRAWINGS

The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:

FIG. 1 is a perspective view of a first embodiment of the axial flow fan blade structure of the present invention;

FIG. 2 is a top view of the first embodiment of the present invention in one aspect;

FIG. 3A is a top view of the first embodiment of the present invention in another aspect;

FIG. 3B is a top view of the first embodiment of the present invention in still another aspect;

FIG. 4A is a perspective exploded view of a second embodiment of the present invention; and

FIG. 4B is a perspective assembled view of the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIG. 1, which is a perspective view of a first embodiment of the axial flow fan blade structure of the present invention. According to the first embodiment, the blade structure 1 includes a fan impeller 10 and an annular body 11. The fan impeller 10 has a hub 101 and multiple blades 102 annularly arranged along a circumference of the hub 101. Each blade 102 has a first flow guide face 1021 and a second flow guide face 1022 opposite to the first flow guide face 1021. The annular body 11 is disposed on the blades 102. The annular body 11 outward extends from the first and second flow guide faces 1021, 1022 and is annularly connected with the blades 102 along the blades 102.

The annular body 11 has multiple connection sections 111 and multiple protrusion sections 112. The connection sections 111 are connected between the adjacent blades 102. The protrusion sections 112 outward extend and protrude from the first and second flow guide faces 1021, 1022. Two sides of each protrusion section 112 extend to respectively connect with two adjacent connection sections 111 to form the annular body 11. Through the annular body 11, the blades 102 are integrally connected with each other to increase the strength of the blades 102. Moreover, the annular body 11 provides flow guide effect to reduce vibration and noise. The annular body 11 is integrally formed on the blades 102 by injection molding.

Please refer to FIG. 2, which is a top view of the first embodiment of the present invention. The blade 102 has a front section 1023, a middle section 1024 and a rear section 1025. The rear section 1025 is fixedly connected to the circumference of the hub 101. The middle section 1024 outward extends from the rear section 1025 to connect with the front section 1023.

Optimally, the annular body 11 is, but not limited to, disposed between the front sections 1023 and the rear sections 1025 of the blades 102 (as shown in FIG. 2). In practice, the annular body 11 can be alternatively disposed on the front sections 1023 of the blades 102 (as shown in FIG. 3A) or the rear sections 1025 of the blades 102 (as shown in FIG. 3B) according to the required strength and flow guide effect of the blade structure 1.

According to the above arrangement, the annular body 11 is integrally formed on the blades 102 to increase the strength of the blades 102 and enhance the fluid efficiency of the fan. In this case, the vibration and noise of the blades 102 can be reduced.

Please refer to FIGS. 4A and 4B. FIG. 4A is a perspective exploded view of a second embodiment of the present invention. FIG. 4B is a perspective assembled view of the second embodiment of the present invention. The above blade structure 1 is applied to an axial flow fan 2. The axial flow fan 2 includes a frame body 20, a fan impeller 10 and an annular body 11. The fan impeller 10 and the annular body 11 together form a blade structure 1. The blade structure 1 is identical to the blade structure 1 of the first embodiment in structure and connection relationship and thus will not be repeatedly described hereinafter.

The frame body 20 has a receiving space 201 and a shaft seat 202 disposed at a center of the receiving space 201. The fan impeller 10 is rotatably assembled with the shaft seat 202 with the blade structure 1 received in the receiving space 201.

In operation of the axial flow fan 2, the annular body 11 not only is able to increase the strength of the blades 102, but also is able to reduce vibration and noise made by the axial flow fan 2 to more effectively enhance the total air volume.

According to the above arrangement, the fluid efficiency of the axial flow fan 2 is increased without increasing the thickness of the blades 102. Also, the vibration and noise made by the blades 102 of the axial flow fan 2 can be reduced. Moreover, the strength of the blades 102 of the axial flow fan 2 is increased.

According to the aforesaid, in comparison with the conventional axial flow fan, the present invention has the following advantages:

1. The fluid efficiency of the axial flow fan is increased.

2. The vibration and noise are reduced.

3. The strength of the blades is increased.

The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. It is understood that many changes and modifications of the above embodiments can be made without departing from the spirit of the present invention. The scope of the present invention is limited only by the appended claims. 

What is claimed is:
 1. An axial flow fan blade structure comprising: a fan impeller having a hub and multiple blades annularly arranged along a circumference of the hub, each blade having a first flow guide face and a second flow guide face opposite to the first flow guide face; and an annular body disposed on the blades, the annular body outward extending from the first and second flow guide faces and being annularly connected with the blades along the blades.
 2. The axial flow fan blade structure as claimed in claim 1, wherein the annular body has multiple connection sections and multiple protrusion sections, the connection sections being connected between the adjacent blades, the protrusion sections outward extending and protruding from the first and second flow guide faces, two sides of each protrusion section extending to respectively connect with two adjacent connection sections to form the annular body.
 3. The axial flow fan blade structure as claimed in claim 1, wherein each blade has a front section, a middle section and a rear section, the rear section being fixedly connected to the circumference of the hub, the middle
 4. The axial flow fan blade structure as claimed in claim 3, wherein the annular body is disposed between the front sections and the rear sections of the blades.
 5. The axial flow fan blade structure as claimed in claim 3, wherein the annular body is selectively disposed on the front sections of the blades or the rear sections of the blades.
 6. The axial flow fan blade structure as claimed in claim 1, wherein the annular body is integrally formed on the blades by injection molding.
 7. An axial flow fan comprising: a frame body having a receiving space and a shaft seat disposed at a center of the receiving space; a fan impeller rotatably assembled with the shaft seat, the fan impeller having a hub and multiple blades annularly arranged along a circumference of the hub, each blade having a first flow guide face and a second flow guide face opposite to the first flow guide face; and an annular body disposed on the blades, the annular body outward extending from the first and second flow guide faces and being annularly connected with the blades along the blades.
 8. The axial flow fan as claimed in claim 7, wherein the annular body has multiple connection sections and multiple protrusion sections, the connection sections being connected between the adjacent blades, the protrusion sections outward extending and protruding from the first and second flow guide faces, two sides of each protrusion section extending to respectively connect with two adjacent connection sections to form the annular body.
 9. The axial flow fan as claimed in claim 7, wherein each blade has a front section, a middle section and a rear section, the rear section being fixedly connected to the circumference of the hub, the middle section outward extending from the rear section to connect with the front section.
 10. The axial flow fan as claimed in claim 9, wherein the annular body is disposed between the front sections and the rear sections of the blades.
 11. The axial flow fan as claimed in claim 9, wherein the annular body is selectively disposed on the front sections of the blades or the rear sections of the blades.
 12. The axial flow fan as claimed in claim 7, wherein the annular body is integrally formed on the blades by injection molding. 